Unpossible: The Plague, R-Type, ...and many more.
Can't remember the real unpossible ones since I deleted them all.
Almost finished: Lost Vikings, Sword of Sodan, Rise of Robots, Beast 1, Wonderdog, Chase HQ II
Want to finish: Goblins III, Lost Vikings, Beast 1,.....
By the way:
I finished Wrath of the Demon and it isn't that difficult if you know that you can save the game at every screen between levels ( use CTRL-S )
Also, Gods is much more difficult in the cracked ( simply copied ) version as in the original !! This is part of a un-recognized copyprotection.